On 15/11/2019 04:45, Raymond, David wrote:
I have done similar things on Linux for years and am now doing them on OpenBSD. Sounds like what you want to do can be done with a simple rsync script. OpenBSD ffs (ufs) should be stable, it has been around for decades in various incarnations. I have never noticed bit rot in this system, though I imagine it could happen if a disk is gradually going bad.
Please correct me if I'm wrong because I don't want to spread incorrect information.
A couple of months ago I read a couple of reports of filesystem corruption on OpenBSD. I didn't have time to investigate deeply and I don't know if these issues were even real. Even if they were real I don't know if the problem was due to user error or a defect in the OS.
Does anybody know anything about this?
That's why multiple backups help.
Agreed. See below.
You might want to set up a raid5 backup, as this detects parity errors. More complicated though.
This is exactly the kind of reason that hybrid volume management systems + filesystems such as Btrfs and ZFS have become popular.
I do not know anything about OpenBSD's LVM.
One weakness in such as system (ask me how I know!) is that if the NAS goes gradually bad, the errors will propagate to the backup. Using rsync without the --delete option most of the time alleviates this somewhat. Only run with --delete when the backup starts getting full and you are confident that your NAS drive is ok.
This is an excellent reason for implementing a system that includes not only backups, but long term storage /archives/ too.
Andrew -- OpenPGP key: EB28 0338 28B7 19DA DAB0 B193 D21D 996E 883B E5B9
